26064

Appears in sequences

• Theta series of E_6 lattice.at n=19A004007
• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 19 ones.at n=21A031787
• Numbers k such that cototient(k) is a square and sets a new record for squares.at n=34A063753
• Triangle T(n, k, m) = (m*(n-k) + 1)*T(n-1, k-1, m) + (m*k + 1)*T(n-1, k, m) - m*f(n,k)*T(n-2, k-1, m) with T(n, 0, m) = T(n, n, m) = 1, f(n, k) = k if k <= floor(n/2) otherwise n-k, and m = 3, read by rows.at n=23A157212
• Triangle T(n, k, m) = (m*(n-k) + 1)*T(n-1, k-1, m) + (m*k + 1)*T(n-1, k, m) - m*f(n,k)*T(n-2, k-1, m) with T(n, 0, m) = T(n, n, m) = 1, f(n, k) = k if k <= floor(n/2) otherwise n-k, and m = 3, read by rows.at n=25A157212
• a(j) = maximum value of n for each distinct increasing value of (Sum of the quadratic non-residues of prime(n) - Sum of the quadratic residues of prime(n)) / prime(n) for each j.at n=22A166263
• Number of 2 X 2 matrices having all terms in {1,...,n} and determinant = 1 (mod 3).at n=16A211071
• Number of (n+1) X (6+1) 0..1 arrays with every 2 X 2 subblock diagonal minimum minus antidiagonal minimum nondecreasing horizontally and diagonal maximum minus antidiagonal maximum nondecreasing vertically.at n=7A253229
• Numbers k such that there is no prime p and index j < k such that A002182(k) = p * A002182(j).at n=10A272606